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Windows 7: System Error When Opening Certain Apps

Dear People,I am sorry if this is wrong forum section, I am new here!
I am currently getting annoyed by an error and I am struggling to get help. This forum IMO is better than the MSDN and TechNet forums because many people manage to solve their problems here! My computer is not even 1 year old and a few weeks ago (maybe 3) an error saying "The program can't start because api-ms-win-core-heap-l1-2-0.dll is missing from you computer. Try reinstalling the program to fix this problem." is popping up. After I click OK, the application starts normally. This only happens with Visual Studio 2012, Visual Studio 2010 Express, Dxtory and MonoDevelop (Unity Version). I have also got Visual Studio 2012 Ultimate Trial on my computer and before this error didn't use to pop up. Yesterday I managed to find something new. When I opened Visual Studio 2012 and created an app with all the frameworks, the only one that gave me the error is .NET Framework 4.5. I think I will have to do a repair install of Windows 7. Please note that: This error did not use to come up before, I tried uninstalling .NET Framework and installing it again, I tried repairing it, I tried repairing Visual Studio 2012 too but that didn't solve the problem. Could the problem be Visual Studio 2010 Express?
Thanks

Thanks again for your reply!
I do not really remember but doing a System Restore can get me in trouble because in 3 weeks I have surely made a lot of things! I still briefly remember that a few weeks before this problem started to appear there was an update. I am not really sure.

When you say you have made a lot of things .... Is there no way you can back them up ? Ans as the trial version is nearly up ... You could try Uninstalling that .... But some how i cant see that working

No I do not think there is a way to back them up since I do not know what I have done and the all of my Restore Points where created after this error started to pop up. Not to consider myself a professional but this problem did not use to happen even with Visual Studio installed. I will try to remove it when the trial expires. Do you think that doing a repair installation of Windows 7 will help me?

I installed Visual Studio 2012 with Visual Studio 2010 because of XNA Studio and I am pretty sure the trouble is not coming from Visual Studio because if it was them, this problem would have appeared when I installed Visual Studio 2012. Visual Studio 90 day trial means about 12 weeks. I installed Visual Studio 2012, then 4 weeks after this problem started to occur. Sorry if I am not obeying you but many people said that uninstalling these programs will mess your registry!

No you are quite right ..... Have you tried a Repair ? I have a friend that uses Visual Studio have contacted them .... Waiting for a reply .... So maybe you might want to hold fire on doing any thing for a few days .... Maybe i might be able to help you better then ... Or maybe another Member here might be able to enlighten you

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